"We applaud Mr Hockey's announcement that the Liberal Party will vote against Labor's filter," said EFA spokesman Colin Jacobs. "The Opposition are very welcome among the ranks of those many organisations and individuals that see the filter as a policy failure."

Senator Conroy's office insists refused classification (RC) material shouldn't be available online and that's what the filter would target.

"This content includes child sexual abuse imagery, bestiality, sexual violence, detailed instruction in crime, violence or drug use and/or material that advocates the doing of a terrorist act," a spokeswoman for the minister said.